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The serpentine belt (auxiliary belt) drives multiple engine accessories from a single ribbed belt — alternator, power steering pump, air conditioning compressor, and sometimes the water pump. A worn or broken belt disables all these systems simultaneously, causing overheating, loss of power steering, and a flat battery.
Modern serpentine belts are made of EPDM rubber that wears differently from older neoprene belts. They may not crack visibly but still lose grip.
Always replace the belt tensioner at the same time as the belt. A worn tensioner is the most common cause of premature belt wear.
Commonly searched OE numbers fitting Serpentine Belt from the TecDoc catalogue.
Common original equipment numbers linked to stocked alternatives.